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charset="utf-8" Currently if a user enqueue a work item using schedule_delayed_work() the used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to schedule_work() that is using system_wq and queue_work(), that makes use again of WORK_CPU_UNBOUND. This lack of consistency cannot be addressed without refactoring the API. system_unbound_wq should be the default workqueue so as not to enforce locality constraints for random work whenever it's not required. Adding system_dfl_wq to encourage its use when unbound work should be used. The old system_unbound_wq will be kept for a few release cycles. Suggested-by: Tejun Heo Signed-off-by: Marco Crivellari Reviewed-by: Thomas Zimmermann --- drivers/gpu/drm/drm_atomic_helper.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atom= ic_helper.c index d5ebe6ea0acb..166085a7e681 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -2222,13 +2222,13 @@ int drm_atomic_helper_commit(struct drm_device *dev, * current layout. * * NOTE: Commit work has multiple phases, first hardware commit, then - * cleanup. We want them to overlap, hence need system_unbound_wq to + * cleanup. We want them to overlap, hence need system_dfl_wq to * make sure work items don't artificially stall on each another. */ =20 drm_atomic_state_get(state); if (nonblock) - queue_work(system_unbound_wq, &state->commit_work); + queue_work(system_dfl_wq, &state->commit_work); else commit_tail(state); =20 @@ -2261,7 +2261,7 @@ EXPORT_SYMBOL(drm_atomic_helper_commit); * * Asynchronous workers need to have sufficient parallelism to be able to = run * different atomic commits on different CRTCs in parallel. The simplest w= ay to - * achieve this is by running them on the &system_unbound_wq work queue. N= ote + * achieve this is by running them on the &system_dfl_wq work queue. Note * that drivers are not required to split up atomic commits and run an * individual commit in parallel - userspace is supposed to do that if it = cares. * But it might be beneficial to do that for modesets, since those necessa= rily --=20 2.51.0 From nobody Sun Feb 8 07:58:27 2026 Received: from mail-wm1-f45.google.com (mail-wm1-f45.google.com [209.85.128.45]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C7C3B366FC7 for ; Thu, 30 Oct 2025 16:20:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.45 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761841257; cv=none; b=OUimVRPY+TsRK6YIUmlnEMA1bQsSAfY9RNSm9RtcCVqQU7GPhcVk5CVN4TBX9RrWSIYJfIrc2wQ9wIoLsnPVoGDmxhCz5xTr7Qc5OO0lZ1VYAnnTYKPJifw4otCGgnbz9PbsV7Lv7eNDxFicsI8tl/YgjQWuYlN1OSbv8Qx9xyw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; 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charset="utf-8" Currently if a user enqueue a work item using schedule_delayed_work() the used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to schedule_work() that is using system_wq and queue_work(), that makes use again of WORK_CPU_UNBOUND. This lack of consistency cannot be addressed without refactoring the API. system_wq should be the per-cpu workqueue, yet in this name nothing makes that clear, so replace system_wq with system_percpu_wq. The old wq (system_wq) will be kept for a few release cycles. Suggested-by: Tejun Heo Signed-off-by: Marco Crivellari Reviewed-by: Thomas Zimmermann --- drivers/gpu/drm/drm_probe_helper.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe= _helper.c index 09b12c30df69..d4dc8cb45bce 100644 --- a/drivers/gpu/drm/drm_probe_helper.c +++ b/drivers/gpu/drm/drm_probe_helper.c @@ -626,7 +626,7 @@ int drm_helper_probe_single_connector_modes(struct drm_= connector *connector, */ dev->mode_config.delayed_event =3D true; if (dev->mode_config.poll_enabled) - mod_delayed_work(system_wq, + mod_delayed_work(system_percpu_wq, &dev->mode_config.output_poll_work, 0); } --=20 2.51.0 From nobody Sun Feb 8 07:58:27 2026 Received: from mail-wr1-f47.google.com (mail-wr1-f47.google.com [209.85.221.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C1607366FCD for ; Thu, 30 Oct 2025 16:20:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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Thu, 30 Oct 2025 09:20:54 -0700 (PDT) Received: from linux.fritz.box ([2a00:6d43:105:c401:e307:1a37:2e76:ce91]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-429952df473sm32758678f8f.42.2025.10.30.09.20.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Oct 2025 09:20:54 -0700 (PDT) From: Marco Crivellari To: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Cc: Tejun Heo , Lai Jiangshan , Frederic Weisbecker , Sebastian Andrzej Siewior , Marco Crivellari , Michal Hocko , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter Subject: [PATCH 3/3] drm/self_refresh: replace use of system_wq with system_percpu_wq Date: Thu, 30 Oct 2025 17:20:43 +0100 Message-ID: <20251030162043.292468-4-marco.crivellari@suse.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251030162043.292468-1-marco.crivellari@suse.com> References: <20251030162043.292468-1-marco.crivellari@suse.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Currently if a user enqueue a work item using schedule_delayed_work() the used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to schedule_work() that is using system_wq and queue_work(), that makes use again of WORK_CPU_UNBOUND. This lack of consistency cannot be addressed without refactoring the API. system_wq should be the per-cpu workqueue, yet in this name nothing makes that clear, so replace system_wq with system_percpu_wq. The old wq (system_wq) will be kept for a few release cycles. Suggested-by: Tejun Heo Signed-off-by: Marco Crivellari Reviewed-by: Thomas Zimmermann --- drivers/gpu/drm/drm_self_refresh_helper.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_self_refresh_helper.c b/drivers/gpu/drm/dr= m_self_refresh_helper.c index c0948586b7fd..36f4237efd4d 100644 --- a/drivers/gpu/drm/drm_self_refresh_helper.c +++ b/drivers/gpu/drm/drm_self_refresh_helper.c @@ -218,7 +218,7 @@ void drm_self_refresh_helper_alter_state(struct drm_ato= mic_state *state) ewma_psr_time_read(&sr_data->exit_avg_ms)) * 2; mutex_unlock(&sr_data->avg_mutex); =20 - mod_delayed_work(system_wq, &sr_data->entry_work, + mod_delayed_work(system_percpu_wq, &sr_data->entry_work, msecs_to_jiffies(delay)); } } --=20 2.51.0